Trimming attachment for sewing machines



April 5, 1932. K; 1,852,611

TRIMMING ATTACHMENT FOR SEWING MACHINES Filed July 25, 1929 2 Sheets-Sheet l i a I fllllllllllil KUMI orrzws April 5, 1932.

. 1. F. HOERIG TRIHHING ATTACHMENT FOR SEWING MACHINES 2 Sheets- Sheet 2 Filed July 25. 1929 Patented Apr. 5, 1932 PATEN 1 @FFICE JOSEPH F. HOERIG, OF MILWAUKEE, WISCONSIN TRIMMING ATTACHMENT Application filed July 25,

This'invention relates to new and useful improvemen-ts'for trimming attachments for sewing machines.

One of the objects of my invention is the j provision of a'trimming attachment for sewing machines which is especially adapted for use in trimming'the edges of material as the same is being stitched together, and it is especially adapted for use in the manufacture m'of shoes. 1 l

Another object of my invention is the provision'of an attachment of the above character which comprises a rockable arm carrying a particular type of cutting knife and which is actuated by means of a cam carried by a reciprocating armwhich is connected up to the operative parts of a sewing machine, whereby to simultaneously impart movement to the rockable member during the operation of the "m'achinewhereby the stitching and trimming can be carried on simultaneously.

A further object of the invention is the provision of atrimming attachment for sewing machines which is comparatively Simple in construction and is so arranged that it can bequickly and readily attached to the conventional type of sewing machine which is used particularly in the manufacture of shoes.

Figure 1 is a side elevation of a sewing ma- 3o"chine illustrating my improvedattachment applied thereto; Figure 2 is a side elevation of the attachment looking toward the side opposite that shown in Figure 1';

Figure 3 is a longitudinal section on the line 33 of Figure 2;

Figure 4: is a detail section on the line 1-4 of Figure 2;

Figure 5 is a detail transverse section-on the line 55 of Figure 3;

Figure 6 is a detail section of the feeder plate and guide illustrating the use of my improved trimmer; and

Figure'7 is a section on the line 7 7 of Fig- Referring more particularly to the draw ings, numeral 1 indicates the usual arm of the sewing machine having the head 2 at its outer end which'carries the mechanism for impartin'ga reciprocating-movement to the needle 3,

FOB SEW'ING MACHINES 1929. Serial N0. 380,992.

said needle operating downwardly through an opening 1 adjacent the feeder plate 5.

In the conventional type of sewing machine used in the manufacture of shoes and the like, the operating shaft 6 carries a groove sleeve 7 having an offset part 8 providing a cam for rocking arm 9.

The arm 9 is supported upon a shaft 10 and has a pin 11 operating in the groove 12 of the cam 7 whereby during rotation of the co shaft 6, arm 9 is rocked and in turn imparts a rocking movement to arm 13 also carried by shaft 10.

A plate 14 is attached to the lower side of the arm 1, and has a downwardly projecting part 15 which carries the guides 16 for rods 17 and 18.

Rod 17 has attached to its lower end an angular bracket 19, the horizontal portion of which supports a rockable arm 20 pivoted V to the horizontal part of the bracket by means of pin 21.

In order to move rod 18 with rod 17 a collar 23 is attached to the rod 18 by means of a set screw 241, the outer end of which extends into the path of a flange 25 on collar 26, carried by rod 17. The collar 26 is maintained in various adjusted positions on rod 17 by means of a set screw 27.

The bracket 19 is adjustably mounted on the lower end of rod 17 by providing the bracket with a slot 19 and positioning the set screw a in the slot, said set screw being carried by the lower end of rod 17, as is more clearly illustrated in Figure 1.

i he rockable arm 20 is normally maintained in close contact with the upper face of the horizontal portion of the bracket 19 by means of an angular guide plate 28 attached to the head 29 at the lower end of rod 17 with its horizontal portion arranged parallel and in spaced relation with the horizontal portion of the bracket so that the arm 20 operates between the two horizontal portions. The arm 20 is normally maintained in an inoperative position, as shown inFigure 3, by means of a coil spring 30, one end of which is attached to a lug 31 on the vertical portion of the bracket 19 and the other end attached to a lug 32 projecting outwardly from the upper face of the arm 20. It will be noted from the showing in Figure 4, that the inner edge of the arm abutts the inner end of an adjusting screw 33 which is threaded through the vertical part of the bracket 19 so that the inward movement of the arm 20 can be limited to various positions and thus limit the movement of the stroke of this arm.

The free end of arm 20 has a downwardly projecting portion 34 to which the knife blade 35 is attached. The lower end of the knife blade 35 is disposed at right angles to the body portion thereof and provided with a cutting edge 36.

This cutting edge 36 is preferably on the angular part 37, and this angular part 3'? during the rocking movement of the arm 20 has its outer face abutting the upstanding guide flange 38 so as to bring the cutting edge into close contact with the edge of the leather strip 39 whichis to be trimmed 01f.

Extending outwardly from the downwardly extending end 34 of the arm 20 is a finger 40 carrying a lug 41 and adapted for engagement with this lug is the camface 42 on plate 43. The plate 43 is rigidly attached to the lower end of rod 18, therefore, it will be noted that when rod 18 is moved downwardly independent of the movement of the rod 17, the cam face 42 will engage lug 41 and move the arm 20 on its pivot away from the vertical portion of the bracket 19.

In order to impart a reciprocating movement to rod 18, this rod carries a block 44 to which is attached rod 45 and the upper end of rod 45 carries a pin 46 operating in slot 47 in the outer end of arm 13. From this, it will be apparent that as the cam sleeve 7 rotates, a rocking movement will be imparted to arm 13 so as to reciprocate rod 18 within the guide 16.

From the foregoing description, the operation of my improved device will be readily apparent, but in order to more clearly disclose the operation, attention is directed to the fact that the operation of the cam sleeve 7 is adjusted so as to cooperate with the reciprocating movement of the needle 3, therefore, as the needle 3 moves down through and then back through the material, a rocking movement will be simultaneously imparted to arm 20 so that the cutting edge 36 will be brought into contact with the edge of a strip being sewed so as to simultaneously trim off this edge while the two pieces of material are being sewed together. It will be noted that in the movement of the cutting blade, 7

the same is brought into close proximity with the material by having the outer face of the blade rocked so as to engage the guide flange 38 whereby to trim oif the rough edge of the material as close as possible.

The rods 17 and 18 are normally urged downwardly by a coil spring 50 which is disposed bet-ween the upper guide arm 16 and the collar 26, as clearly illustrated in Fig ure 3.

The outer end of the block 44 reciprocates within the slot 52 formed with the guide plate 53 secured to the outer side of arm 15, as clearly shown in Figure 1.

It will be apparent that the rockable arm 20 is securely maintained in contact with the upper face of the horizontal part of bracket 19 and the outward movement of the arm will not exceed the width of the horizontal portion of the angular plate :28, so that the horizontal portion of this plate and the horizontal portion of bracket 19 form a suitable guide to the rocking movement of arm 20 and the rocking stroke of this arm can be adjusted through the medium of the set screw 33.

It is a well known fact that in a great many instances, sewing machines which are used in the construction of shoes are provided with adjustable features for adjusting the cutting knife toward and away from the work and it is, therefore, apparent that in using my device in connection with certain well known machines on the market at the present time, the angular position of the arm 18 may be readily adjusted so that the rods 17 and 18 may likewise be adjusted vertically in order to bring the knife blade 35 into close proximity with the work, and it is very essential that this adjustment be carried out, particularly in View of the position of the knife blade 35 with respect to the feeder plate 5, so that the knife will be properly positioned for cutting the lining material at the proper point. Attention is also directed to the fact that with my improved device, the knife might be adjusted slightly on an angle instead of on a direct vertical, and from this adjustment, it will be apparent that the cutting edge will be in proper position to sever the lining material at the proper point.

It will be apparent from the foregoing, that I have provided a comparatively simple and inexpensive device which can be readily attached to conventional types of sewing machines which are particularly adapted for use in manufacture of shoes and with this improved device, the rough edges of one piece of the lining can be quickly trimmed off while this material is being sewed to another part and the various parts can be quickly and readily adjusted to accommodate the same to various types of work.

While I have shown and described the preferred embodiment of my invention, it will be apparent that slight changes may be made in the construction when putting the invention into practice without departing from the spirit of the same or the scope of the appended claims.

I claim:

1. In a sewing machine, an angular support, an arm pivotally mounted upon the L horizontal portion of the support, a cutting edge at one end of the arm, yieldable means urging the arm in one direction, a stud carried bythe arm, a reciprocating rod mounted above the arm, and a cam member carried by the rod for engaging the stud to impart a lateral movement to said arm against the tension of said yieldable means. 1

2. In a sewing machine, parallel movable rods, an angular bracket at the lower end of one of said rods, a rockable arm carried by the horizontal portion of the bracket, means for normally urging the arm toward the vertical portion of the bracket, a stud carried by the arm, a cam member carried by the other rod and engaging said stud whereby movement of the second rod will impart a rocking movement to the arm against the tension of said urging means.

3. In a device of the class described, an adjustable angular bracket, a rockable arm pivoted upon the horizontal portion of the bracket, means normally urging the arm toward the vertical portion of the bracket, an adjusting member carried by the bracket and adapted to be engaged by one end of the arm for limiting the movement of the arm, a stud carried by the arm, a cutting edge adjacent one end of the arm and a movable cam member adapted to cooperate with the stud for moving the arm away from the vertical portion of the bracket against the tension of the urging means.

4. In combination with a sewing machine arm having a head, of a supporting member suspended from the arm and arranged beneath the same, a pivoted arm carried by the supporting member for swinging movement in a horizontal plane, a cutting'edge at one end of the pivoted arm, and means for imparting a rocking movement to. said pivoted arm.

5. In combination with a sewing machine arm having a head, of a supporting member suspended from the arm and'arranged beneath the same, a pivoted arm carried by the supporting member for swinging movement in a horizontal plane, a cutting edge at one end of the pivoted arm, means for imparting a rocln'ng movement to said pivoted arm, and means for adjusting the amount of movement of said pivoted arm.

6. In combination with a sewing machine arm having a head, a support suspended from the arm and arranged adjacent the lower end of the head, a pivoted arm carried by the support for swinging movement in a horizontal plane, a cutting edge at one end of the arm, yieldable means urging the arm in one direction, means for moving the pivoted arm in the other direction against the tension of said yieldable means, and adjustable means for limiting the movement of said arm.

7. In combination with a sewing machine including an arm and a head, of a support projecting toward the lower end of the head,

a pair of parallel rods carried by the support, a cutting blade mounted for swinging movement in a horizontal plane carried by one ofsaid rods, means for reciprocating the other rod through the driven shaft, and means for swinging the blade from said last mentioned ro 9. In combination with a sewing machine including an arm, a head on the outer end of the arm, and a driven shaft rotatably mounted in said arm, of a support secured to the arm and projecting toward the lower end of said head, a pair of spaced parallel rods carried by the support for sliding movement, a blade mounted for swinging movement in a horizontal plane on the lower end of one of said rods, a collar on the last mentioned rod having a lateral flange, an expansion spring sur-' rounding said last mentioned rod and engag ing the collar and the support for normally urging the last mentioned rod away from the support, a collar carried by the other rod and having a portion arranged in the path of the flange, means for reciprocating the other rod from the driven shaft, means for rocking the cutting blade from said other rod and said blade having a portion thereof mounted in a substantially vertical plane.

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in the county of Milwaukee and State of Wisconsin.

JOSEPH F. HOERIG. 

